5 Key Biohacks for Slowing Down Aging
Siim Land — Author of Metabolic Autophagy & Longevity Leap & Stronger by Stress, Slowest Aging Person on the Planet
Best-Selling Author (Stronger by Stress, Metabolic Autophagy etc.) & High-Performance Coach
Siim Land challenges common anti-aging myths, offering five scientifically
Slowing down the speed of aging is mostly about increasing health span, which essentially means adding healthy years to your life and being more functionally independent.
Summary
- Maintain a high VO2 max to significantly reduce mortality risk, as cardiorespiratory fitness is a stronger predictor of longevity and functional health than muscle mass alone.
- Prioritize building muscle strength through resistance training to prevent sarcopenia and maintain the ability to perform everyday physical activities independently into old age.
- Focus on reducing visceral fat and maintaining a healthy waist-to-hip ratio to prevent metabolic syndrome and the secretion of pro-inflammatory cytokines that damage internal organs.
- Align circadian rhythms with natural light cycles to optimize NAD levels and melatonin production, which coordinate essential cellular repair, detoxification, and antioxidant defense.
- Supplement with glycine and hydrolyzed collagen peptides to support skin elasticity, joint health, and the production of glutathione, the body's master antioxidant.
Article
Five Key Biohacks For Slowing Down Aging And Increasing Healthspan
At Biohacker Summit X London, Siim Land Argued That Longevity Begins Long Before Old Age
On 1 September 2023 in London, at Biohacker Summit X London, the best-selling author and high-performance coach Siim Land delivered a brisk, data-heavy case for a simple idea that often gets lost in the fantasy of longevity culture: aging well was less about chasing immortality than about defending function.
Land, speaking on **“5 Key Biohacks for Slowing Down Aging”**, framed the matter not as vanity, but as healthspan. The goal, he suggested, was not merely to add years to life, but to add strength, resilience, mobility and independence to those years. In a field often crowded with miracle claims and silver-bullet supplements, his presentation stood out for its insistence on a hierarchy. Some interventions mattered more than others. And the five he chose were strikingly grounded in physiology rather than hype.
VO2 Max Was Presented As The Most Powerful Fitness Marker For Longevity
If there was a headline statistic in Land’s talk, it was this: “The individuals with the highest VO2 max have up to four times lower risk of all-cause mortality. Being unfit increases your mortality risk even more than smoking or obesity.”
That is the kind of statement that lands with force because it rearranges common assumptions. We are used to talking about body weight, blood markers, or the visible signs of health. Land pointed instead to cardiorespiratory fitness, the body’s capacity to use oxygen under strain, as one of the sharpest predictors of survival.
He argued that while strength mattered, VO2 max mattered more in the hierarchy of mortality reduction. The ideal, he said, was to build both, but if people wanted to understand which system most clearly separated robust aging from accelerated decline, aerobic fitness was impossible to ignore.
The practical takeaway was refreshingly specific. Land pointed to interval training as one of the most efficient tools for improving VO2 max, particularly protocols such as repeated four-minute efforts near maximum heart rate. This was not fitness for aesthetics. It was fitness as insurance against frailty, disease and early death.
Strength Was Not About Appearance But About Preserving Human Freedom
Yet Land was equally clear that longevity without strength would be a hollow promise. Muscle, in his telling, was not a cosmetic asset but a civilisational one, the difference between independence and dependency.
“Physical activity protects your body from becoming Wagyu Beef,” he said, deploying an image vivid enough to linger. “You can be three decades younger based on your muscle composition if you maintain the physical activity that keeps your muscles from deteriorating as you age.”
The point beneath the flourish was clinically serious. Sarcopenia, the age-related loss of muscle mass and strength, is not simply a consequence of getting older. It is one of the mechanisms by which later life becomes smaller, harder and less autonomous. Land emphasised grip strength as a useful shorthand marker, linking low strength not only to mortality but to dementia risk and the gradual erosion of daily competence.
The real tragedy of muscle loss, his talk implied, is not what it does to the mirror. It is what it does to ordinary life: getting out of a chair, dressing, carrying, climbing, lifting, standing, recovering. Resistance training, particularly compound movements performed consistently and safely, was presented as one of the surest ways to preserve those abilities.
The Fat That Mattered Most Was The Fat You Could Not Always See
Land’s third principle cut through the shallowness of weight discourse. The real issue, he argued, was not simply being slim, but being “thin on the inside”.
“Having too much internal fat is bad for your heart and longevity,” he said. “Calorie restriction and exercise work by activating your body's longevity pathways like autophagy and increasing NAD to keep your cells youthful.”
This was an argument about visceral fat, the metabolically active fat packed around the organs, rather than the more visible fat under the skin. Visceral fat, Land explained, acts less like passive storage and more like a disruptive organ in its own right, secreting inflammatory signals, deranging metabolic function and pushing the body towards insulin resistance, cardiovascular disease and metabolic syndrome.
He highlighted waist-to-hip ratio as a more revealing marker than body mass index alone, urging attention to the architecture of fat distribution, not merely total size. The methods he proposed were not fashionable novelties but familiar disciplines: calorie restriction, exercise, intermittent fasting, lower intake of industrial fructose and alcohol, and better stress management and sleep.
If modern culture has often treated body composition as a matter of appearance, Land treated it as a matter of internal terrain.
Circadian Rhythm Was Cast As An Invisible Engine Of Repair
The fourth biohack was perhaps the least glamorous and the most quietly profound: align the circadian rhythm.
“Melatonin is the most powerful antioxidant and the main hormone that keeps you young,” Land said. “Proper circadian rhythm alignment enables your body to access the most effective repair mechanisms that happen during sleep.”
In an age of backlit insomnia, erratic schedules and artificial light at every hour, this was a reminder that the body still obeys ancient signals. Light in the morning, darkness in the evening, regularity in sleep and waking, these were not lifestyle niceties in Land’s framework. They were biological instructions that shaped hormonal timing, antioxidant defence, cellular repair and the recycling of NAD, a key molecule implicated in energy metabolism and longevity pathways.
He described circadian disruption, whether from shift work, jet lag or habitual late-night light exposure, as a kind of low-grade sabotage. The body misses its cues. Melatonin falls. Cortisol drifts. Repair is blunted. Aging accelerates not in dramatic bursts, but in a thousand small missed opportunities for restoration.
The prescription was almost austere in its simplicity: bright light exposure in the morning, dimmer amber-toned light in the evening, and a sleep-wake rhythm that respected rather than defied the day.
Collagen And GlyNAC Were Framed As Targeted Nutritional Support, Not Magic
Only in the fifth and final principle did Land move fully into supplementation, though even here he resisted the language of miracle cures. His focus was on hydrolysed collagen peptides, glycine and GlyNAC, the combination of glycine and N-acetylcysteine.
“Glycine and NAC supplementation has been shown to reverse hallmarks of aging and improve functional outcomes in humans,” he said. “It has a restorative effect on the body while improving skin longevity and reducing the visible signs of aging.”
Collagen, he noted, declines with age, contributing to wrinkles, reduced skin elasticity and weaker connective tissues. Hydrolysed collagen peptides, because of their bioavailability, were presented as the most evidence-supported format for supporting skin and joint health.
But the deeper point involved glycine, an amino acid central not just to collagen formation but to glutathione production. Glutathione, often described as the body’s master antioxidant, plays a crucial role in defending cells against oxidative stress and inflammation. GlyNAC, Land argued, was among the more compelling human-tested longevity supplements because it appeared to support this system in ways that translated into measurable functional benefit.
Unlike the extravagant claims that often stain the anti-aging market, Land’s case here rested on restoration rather than fantasy. Support the body’s existing repair systems. Replenish what age and modern living deplete. Improve resilience from the inside out.
The Strongest Message Was That Healthspan Remained Earned, Not Bought
What made the talk memorable was not any single biohack, but the order in which Land placed them. Before the powders and peptides came fitness, strength, metabolic health and sleep-wake alignment. Before the supplement stack came the body’s basic operating system.
That hierarchy mattered. It suggested that slowing aging was less about discovering a hidden trick than about taking the known mechanisms seriously enough to act on them. A higher VO2 max. Stronger muscles. Less visceral fat. Better light hygiene. Smarter nutritional support. None of it sounded magical. That was precisely the point.
At Biohacker Summit X London, Siim Land offered a version of longevity stripped of mysticism. Aging, he suggested, could be slowed not by denial of biology, but by deeper obedience to it. And in a culture that often wants youth without discipline, that may have been the most radical message of all.
Part of Biohacker Summit X London